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Cities like Harlem and Chicago are often associated with “The Great Black Renaissance,” but for a brief time in the 20th century, Pittsburgh was an epicenter for black art, sports, business and political influence.

Hear about an underground tunnel system in Pittsburgh's Lawrenceville neighborhood, as part of our series, 90.5 WESA's Good Question!

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Cars rumble overhead as historian John Schalcosky trudges through crunching snow beneath the 40th Street Bridge in Lawrenceville. Gesturing toward the Allegheny River bank, he flicks on his iPhone flashlight.